Repeating burglar-alarm.



E. ALLEN.

RBPEATING BURGLAR ALARM.'

APPLIOATION FILED 00T. 5, 1908.

Q'Yl 3. Patented Oct/1, 1910.

F71 @ya ERNEST ALLEN, OF LOS ANGELES, CALIFORNIA.

REPEATING BURGLAR-ALARM.

corsie.

Specification of Letters Patent.

Application filed October 5, 1908.

Patented (Pct. et, 1910.

Serial No. 456,350.

.To all whom tt may concern:

Be it known that I, ERNEST ALLEN, a subject of the King of England, who have declared my intention of becoming a citizen of the "United States, residing at Los lltngeles, in the county of Los Angeles and State of California, have invented a new and useful Repeating Burgla eAlarm, of which the following is a specification.

The main object of the present invention is to provide a burglar alarm which will give a succession of detonations on the opening of a closure, such as a door or window for an apartment or building.

Another object of the invention is to provide means for conveniently placing the device in and out of operative position.

Theaccompanying drawings illustrate my invention.

Figure 1 is a front elevation of a portion of the door showing the device applied therei to. Fig. 2 is an end elevation thereof, showing it in operative position. Fig. 3 is an end elevation of a portion of the door showing the device applied thereto and in inoperative position. Fig. 4 is a vert-ical section of the device. Fig. 5 is an end view of adjoining parts of two window sashes showing burglar alarm device applied thereto.

Referring to Figs. 1. and 3 the device comA prises a disk, wheel or rotatable member l mounted to rotate on a journal 3, extending from an. arm 3, pivoted at lto a bracket .3, :fastened by suitable means to a door or olosure Arm 3 extends obliquely outward and downward from its pivotal support 4t to allow the wheel 1 to rest on the floor 7 or other object in proximity to closure 6. A spring 8 connects said arm and the bracket 5 to draw the said arm toward the closure G and by reason of the Obliquity of said arm to cause the same to bear against the floor 7. Viheel 1 is hollow and has inwardly projecting caps on the inner side of rim 10 and a series of brackets, lugs or projections 11 which have angular extensions or cap holders 12 projecting therefrom in a circumferential direction relatively to the axis of the wheel; these projections being adapted to receive Afulminate caps or other detonating means 13, which tit on said projections so that they are frictionally held from such engagement. A spring hammer 15 is secured to the head or collar 9 on the fixed journal 2 of wheel 1 and carries at its end a head 16 adapted to impinge on the caps aforesaid. Head or collar 16 may be integral with journal 2 and the latter may be riveted to arm 1, thus securing the wheel 1 in place while allowing rotation thereof. The said hammer may consist of a piece of spring metal bent in bow-shape and enlarged atthe end to form a head. The several parts of the apparatus including the disk, supporting arm and bracket may be cheaply formed of sheet metal bent, brought to proper shape by bending or shaping, or they may be cast, in either case, the construct-ion is inexpensive. `Wheel or rotatable member 1 may have its rim provided with traction increasing means such as felt or rubber 17, see Fig. 2, or with small projections as indicated at 17 in Fig. l.

The operation of the device is as follows: lVhen the door is closed and it is desired to set the device for giving notification of unwarranted opening of a door, the wheel 1 is turned down to position shown in Fig. 2 so as to rest on the floor, and caps 13 are placed on holders 12. If then the door is opened the wheel will run on the floor and the hammer 15 being stationary, the rolling motion of the wheel will cause the lugs 11 to pass the hammer. As each lug passes the hammer it first bends the hammer, the hammer and lug slipping on one another, until the bending and slipping is such as to allow the hammer to slip over the lug, \\'hereupon it springs forcibly to position to inipinge against the nextlug or against the cap placed thereon. As the result, the caps are detonated successively, giving a loud and repeated alarm and serving as an effectual warning that the door has been opened. In day time if it is not desired to use the device as an alarm, it is turned up in position shown in Fig. 8. A spring S then serves to hold the device in this inoperative position. In using the device for a window alarm it may be applied to the top, say, of the lower sash, indicated at 1S in Fig. 5, the bracket 5 being fastened to the top stile of said sash and the wheel 1 being adapted to bear against the inside of one vertical stile 19 of the sash. In this case movement of either the upper or lower sash will cause rotation of the wheel and detonation of the caps as aforesaid.

That l claim is:

1. In combination with a closure means and a floor, a rotatable member and a plurality of cap carrying means projecting therefrom, a pivotally supported arm carrying said member, a spring hammer carried by said arm and lying in the pathof rotation of Said ea p carrying means and operated thereby7 and means for yieldingly holding said rotatable member against said eloenre means or said lloor.

2. In eon'ibination with a closure means, ot a rotatable member, etude on said rotata ble member, meanS on said Studs for carrying nps, said meanS projecting forwardly trom said studs, a piyotally supported arm carrying said member, and a Spring hammer carried by Said arm and extending in position to engage the Cap carrying' means and adapted to be operated thereby.

3. ln combination with a closure means7 of a rotatable member having a plurality of Cap carrying' means projecting forwardly in the path of rotation, a pivotally Supported arm Carrying said member, and a spring hammer carried by said arm and extending into the path of rotation of Said cap Carrying means and adapted to be operated thereby.

In testimony whereof, have hereunto eet my hand at Los Angeles California this 28th day of September 1908.

G. T. HAGKLEY, FRANK L. A. GRAHAM. 

